Mine the border.
It's no time for stopgap measures... the problems in the middle-east are created by Islam and the potentates who agitate its violent underpinnings within the masses.
Kill off the major subsidizers of jihad(Iran/Syria) ... and the movement, worldwide, will wither and rot.
Tough to mine the roads, and the question is how many of the bomber boys, just drive across or come on the bus? I suspect more than come through the desert. How about closing the border? Forcing the bombers overland, and giving surveillance a chance. Any illegal border crossing, is death. One must also consider there is a Turkish border, a SA border, an Iranian border, a Kuwaiti border, an air border and a sea border. Must be a quagmire in there somewhere.